Embedded Spiral Patterns in the Cool Core of the Massive Cluster of Galaxies Abell 1835

Journal Article · Wed Mar 01 04:00:00 EST 2017 · Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/AA5C3E· OSTI ID:22869282

Shutaro, Ueda; Tadayasu, Dotani ^[1]

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1. Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA) 3-1-1 Yoshinodai, Chuo Sagamihara, Kanagawa 252-5210 (Japan)

We present the properties of an intracluster medium (ICM) in the cool core of the massive cluster of galaxies, Abell 1835, obtained with the data from the Chandra X-ray Observatory. We find distinctive spiral patterns with a radius of 70 kpc (or 18″) as a whole in the residual image of the X-ray surface brightness after the two-dimensional ellipse model of surface brightness is subtracted. The size is smaller by a factor of 2–4 than that of other clusters that are known to have a similar pattern. The spiral patterns consist of two arms. One of them appears as positive, and the other appears as negative excesses in the residual image. Their X-ray spectra show that the ICM temperatures in the positive- and negative-excess regions are 5.09{sub −0.13}{sup +0.12} keV and 6.52{sub −0.15}{sup +0.18} keV, respectively. In contrast, no significant difference is found in the abundance or pressure, the latter of which suggests that the ICM in the two regions of the spiral patterns is near or is in pressure equilibrium. The spatially resolved X-ray spectroscopy of the central region (r<40{sup ′′}), divided into 92 sub-regions indicates that Abell 1835 is a typical cool core cluster. We also find that the spiral patterns extend from the cool core out to the hotter surrounding ICM. The residual image reveals some lumpy substructures in the cool core. The line of sight component of the disturbance velocity that is responsible for the substructures is estimated to be lower than 600 km s{sup −1}. Abell 1835 may now be experiencing an off-axis minor merger.

• OSTI ID: 22869282
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 837; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BRIGHTNESS
DISTURBANCES
EQUILIBRIUM
GALAXY CLUSTERS
KEV RANGE 01-10
TWO-DIMENSIONAL CALCULATIONS
VELOCITY
X RADIATION
X-RAY GALAXIES
X-RAY SPECTRA